Feare C J
Wellcome Marine Laboratory, Robin Hood's Bay, Yorkshire, England.
Oecologia. 1971 Jun;7(2):117-126. doi: 10.1007/BF00346354.
Three kinds of aggregation behaviour were observed in an exposed shore population of Nucella lapillus. Aggregations on the open rock surface during the summer protected dogwhelks from water movement, and were not found on shores where the topography conferred protection. Feeding occurred mainly within these aggregations, probably because individuals experienced less disturbance there than when isolated. Physical contact was important in holding animals together.Winter and pre-breeding aggregations were usually found in clefts or pools. All age groups formed winter aggregations, but those of immature dogwhelks were not as permanent as those of adults, and the latter merged with the prebreeding aggregations. Winter aggregations protected dogwhelks from dislodgment when their ability to regain a foothold was reduced by low temperatures, while pre-breeding aggregations brought the sexes together for fertilization, but the permanence of adult winter aggregations suggested that reproductive activity may have been occurring within them.
在暴露于外的海滨小滨螺种群中观察到了三种聚集行为。夏季在开阔岩石表面的聚集为滨螺提供了免受水流影响的保护，而在地形能提供保护的海岸则未发现这种聚集。进食主要发生在这些聚集体内部，可能是因为个体在聚集体中受到的干扰比单独时少。身体接触对于使动物聚集在一起很重要。冬季和繁殖前的聚集通常出现在裂缝或水坑中。所有年龄组都会形成冬季聚集体，但未成熟滨螺的聚集体不如成年滨螺的聚集体持久，而成年滨螺的聚集体会与繁殖前的聚集体合并。冬季聚集体在滨螺因低温而重新站稳脚跟的能力降低时保护它们不被冲走，而繁殖前的聚集体则使雌雄两性聚集在一起进行受精，但成年滨螺冬季聚集体的持久性表明其中可能已经发生了繁殖活动。
